classdef ShipModel
    properties
        length; % 船长 (米)
        width; % 船宽 (米)
        draft; % 吃水 (米)
        displacement; % 排水量 (吨)
        drag_coefficient; % 阻力系数 (无量纲)
        windage_area; % 迎风面积 (平方米)
        propulsion_force; % 推进力 (牛顿)
        
        position; % 位置 (米)
        velocity; % 速度 (米/秒)
        acceleration; % 加速度 (米/秒^2)
    end
    
    methods
        % 构造函数
        function obj = ShipModel(length, width, draft, displacement, drag_coefficient, windage_area, propulsion_force)
            obj.length = length;
            obj.width = width;
            obj.draft = draft;
            obj.displacement = displacement;
            obj.drag_coefficient = drag_coefficient;
            obj.windage_area = windage_area;
            obj.propulsion_force = propulsion_force;
            
            obj.position = [0, 0, 0]; % 初始位置
            obj.velocity = [0, 0, 0]; % 初始速度
            obj.acceleration = [0, 0, 0]; % 初始加速度
        end
        
        % 计算风力
        function wind_force = calculate_wind_force(obj, wind_speed, wind_direction)
            wind_force = 0.5 * obj.drag_coefficient * obj.windage_area * wind_speed^2 * [-sin(wind_direction), cos(wind_direction), 0]';
        end
        
        function propulsion_force = calculate_propulsion_force(obj)
            propulsion_force = [obj.propulsion_force, 0, 0]';
        end
        
        % 计算洋流力
        function current_force = calculate_current_force(obj, current_speed, current_direction)
            current_force = -0.5 * obj.drag_coefficient * obj.windage_area * current_speed^2 * [-sin(current_direction), cos(current_direction), 0]';
        end
        
        % 计算波浪力
        function wave_force = calculate_wave_force(obj, t)
            wave_force = [0, 0, 1000 * sin(2 * pi * t / 10)]'; % 假设波浪力正弦变化
        end
        
        % 计算其他力
        function other_forces = calculate_other_forces(obj)
            other_forces = [obj.propulsion_force, 0, 0]'; % 假设推进力沿船体纵轴
        end
        
        % 计算运动学
        function calculate_kinematics(obj, wind_force, current_force, wave_force, other_forces, time_step)
            % 计算加速度
            obj.acceleration = (wind_force + current_force + wave_force + other_forces) / obj.displacement;
            
            % 计算速度
            obj.velocity = obj.velocity + obj.acceleration * time_step;
            
            % 计算位置
            obj.position = obj.position + obj.velocity * time_step;
        end
    end
end